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Working with LFOs

LFOs (Low Frequency Oscillator) are used to create modulation of property values over time. The properties of the LFO are:

Property

Description

Depth

The amplitude variation of the oscillator (in percentage)

Frequency

The number of cycles per second (in Hz)

Waveform

The shape of the modulator

Smoothing

Low-pass filter over the waveform to smooth hard edges (in percentage)

PWM (Pulse Width Modulation)

The width of the pulse wave, only applies to the Square waveform (in percentage)

Attack

The time it takes for the oscillator to reach full amplitude (in seconds)

Initial Phase

The initial phase of the oscillator waveform (in degrees)

Scope

Define how LFO instances are created:

  • Voice: An instance of LFO is created for every sound/object playback.

  • Note/Event: An instance of LFO is created for every playing instance, or note when used in MIDI context.

  • Game Object: An instance of LFO is created for each game object.

  • Global: A single LFO is created for the whole project.

In Wwise, some properties are additive (Voice Volume, Voice Pitch, etc...), and some are exclusive. When adding an LFO on the additive properties, the LFO modulation is added to the current value of the property. When adding an LFO on the exclusive properties, the LFO modulation replace the current value of the property.

To modulate the Voice Volume with a LFO:

  1. In the Project Explorer, select an object to add LFO.

  2. In the Property Editor, go to the RTPC tab.

  3. In the RTPC list, click the [>>] button.

  4. From the selector menu, select Voice Volume.

  5. Click the X-axis selector button.

  6. From the selector menu, select LFO > Default (Custom).

  7. Click the [...] button to edit the LFO properties.

  8. Edit the curve to set the range of modulation.

LFO objects can be created as Custom or ShareSet. Custom objects are stored in-place, directly inside the object that has it. ShareSets are stored in a separate work-unit and can be re-used across objects.

[Caution] Caution

A modulator's processing time depends on its RTPC usage. For most properties, a modulator is evaluated once per audio frame. However, for the property voice volume, the associated modulator is evaluated at every frame. Use modulators selectively as they can consume a significant amount of memory and CPU.

[Note] Note

The RTPC cursors for Modulators, both LFO and Envelope, do not tell you their specific values at any point in time since they are determined by the modulator's internal properties.

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